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化学教学中实施元认知监控的探究 总被引:1,自引:0,他引:1
1问题的提出在当今科学技术迅速发展的信息时代,培养学生独立的学习能力,教会学生如何学习,是实施素质教育的要求。在这个前提下,我们在化学教学中实施元认知监控的尝试,收到了一定的成效。元认知是美国心理学家佛雷维尔(J.H.Flavell)于20世纪70年代提出的,已广泛引起了我国心理学界的重视。佛雷维尔认为:元认知就是指主体对自身认知活动的认知:即对人自身的感知、注意、记忆、想象、思维、理解等认知过程进行积极的自我监视、自我反思、自我解悟、自我调控的过程。它解决了学生"会学"的理论基础。元认知是人所特… 相似文献
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学生元认知能力的高低进接影响其学习的质量和效率.教学实验表明在高中化学教学中应用元认知教学能提高学生的元认知能力、有效地控制学习分化、提高学生的化学学业成绩.实验说明,在教学中提高学生的元认知能力,对中等生、学困生的学习成绩的提高,效果特别显著. 相似文献
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理解著文强化记忆——化学研究性学习过程中穿插诗歌教学的尝试 总被引:3,自引:0,他引:3
将诗歌引入到化学教学中,增强了学生对化学知识的理解,促使了学生对化学知识的记忆,加强了化学知识与社会、与相关学科的联系,是研究性学习的一种尝试。文中介绍了对在化学学习过程中穿插诗歌教学的理解与做法。 相似文献
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初中生化学问题解决中元认知能力的现状分析 总被引:2,自引:2,他引:0
初中生化学问题解决中的元认知能力是构成学生化学问题解决能力的重要成分,对学生化学问题解决起着关键作用。本研究采用访谈和调查的方法对上述问题做了初步探讨。研究结果表明:(1)初中生化学问题解决中元认知能力总体水平不高,其中监测性、调控性和评价性总体偏低。(2)学优生、中等生和学困生在化学问题解决中的元认知能力差异非常显著。(3)化学问题解决中元认知能力的高低是影响初中生化学学习成绩的因素之一。 相似文献
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初中生化学问题解决中元认知水平的高低直接影响着其化学问题解决的质量和效率。如何通过提高初中生化学问题解决中的元认知能力,进而提高其问题解决的能力,是化学教育研究的一个重要课题。本文通过实验对这一问题进行了研究,实验结果表明:(1)初中生在化学问题解决的过程中对自己的自信心进行评估,能提高其化学学习成绩。(2)化学问题解决中元认知能力的训练对于不同层次的初中生的效果是不一样,其中中等生的效果最明显。(3)自我提问单的使用是提高初中生化学问题解决中的元认知能力的有效方法之一。 相似文献
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E. F. Dankova V. A. Bakulev Yu. Yu. Morzherin 《Chemistry of Heterocyclic Compounds》1992,28(8):931-936
The reaction of malonothioamides with benzene-sulfonyl azide and 2-azido-3-ethylbenzthiazolium tetrafluoroborate gave amides of 2-diazothiomalonic acid, which underwent cyclization to a mixture of 5-N-R-amino-1,2,3-thiadiazole-4-carbothioamides and 5-amino-1,2,3-thiadiazole-4-N-R-carbothioamides. The ratio of the isomeric thiadiazoles formed in this reaction is the same as in the reactions of 2-diazo-2-cyanoacetamides, 5-amino-1,2,3-thiadiazole- and 5-mercapto-1,2,3-triazole-4-carboxamides with P4S10 and of 5-amino-1, 2,3-thiadiazole-4-carbonitriles with H2S; it is characteristic of the influence of substituents on the reactivity of -diazothioacetamides. It was found that the cyclization of the diazo compounds is accelerated when electron-acceptor substituents are attached to the nitrogen atom of the carbothioamide group.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1106–1112, August, 1992. 相似文献
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利用手持技术改进测定乙醇分子结构实验 总被引:1,自引:0,他引:1
利用压强传感器代替排水集气法,改进测定乙醇分子结构实验的仪器装置,并探索最佳反应条件。另外,设计两个空白实验,结合压强变化曲线对实验误差进行相关讨论。 相似文献
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由于石化行业的生产需要,其材质的使用具有多样性和广泛性,经常会出现顾客委托的测试样品的一个或几个元素跨越光谱仪现有测试程序测量范围的情况。本法通过对光谱仪测试原理的认识,根据光谱仪的测试能力及标样的采集,实现了一个或几个元素测量范围的扩展,并对其测量的影响因素进行了研究。 相似文献
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Mustafa R. Ibrahim Zacharia A. Fataftah Paul von Ragu Schleyer Peter D. Stout 《Journal of computational chemistry》1987,8(8):1131-1138
Sets of hydrogen molecule equivalents have been developed which permit the calculation of hydrogenation of different types of carbon-carbon bonds from ab initio total energies (3-21G and 6-31G* basis sets, and, to a more limited extent, for MP2/6-31G* data) of reactants and products. The calculated enthalpies of hydrogenation are in good agreement with experiment for unstrained molecules, with average errors on the order of 2 kcal/mol. The 6-31G* equivalents allow the enthalpies for strained molecules to be calculated accurately, but the 3-21G equivalents do not. The equivalents for both basis sets have been tested by calculating the enthalpies of hydrogenation of carbon-carbon bonds in nitrogen- and oxygen-containing organic molecules, free radicals, and classical carbocations. The results are in good agreement with experiment in most cases. 相似文献
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V. I. Bol'shakova L. I. Demenkova É. N. Shmidt V. A. Pentegova 《Chemistry of Natural Compounds》1988,24(6):691-694
The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae. 相似文献
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V. I. Bol'shakova L. I. Demenkova É. N. Shmidt V. A. Pentegova 《Chemistry of Natural Compounds》1989,24(6):691-694
The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodynkh Soedinenii, No. 6, pp. 812–816, November–December, 1988. 相似文献